About 20 wave-lengths which have been measured on grating spectrometers have been given for the calibration of prism spectrometers in region from about 2μ to 24μ. A number of lines due to H2O and CO2 can be normally observed due to atmospheric absorption. Since not many sharp bands have been measured on grating spectrometers from 7μ to 13μ, several sharp bands in ethyl alcohol and amyl alcohol in the liquid state have been measured in this region. The values found in the present work check well with those previously found by Weniger except those in the 9μ and 10μ region. Here some of the bands differ by about 0.2μ from those found in this work. This difference is probably due to the fact that Weniger did not have the more accurate values of the index of refraction of rocksalt due to Paschen at his disposal.
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